2 * Copyright (C) 2007 Oracle. All rights reserved.
3 * Copyright (C) 2008 Morey Roof. All rights reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License v2 as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public
15 * License along with this program; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 021110-1307, USA.
23 #include <sys/ioctl.h>
24 #include <sys/mount.h>
25 #include <sys/types.h>
27 #include <uuid/uuid.h>
32 #include <linux/loop.h>
33 #include <linux/major.h>
34 #include <linux/kdev_t.h>
36 #include <blkid/blkid.h>
38 #include <sys/statfs.h>
39 #include <linux/magic.h>
41 #include "kerncompat.h"
42 #include "radix-tree.h"
45 #include "transaction.h"
52 #define BLKDISCARD _IO(0x12,119)
55 static int btrfs_scan_done = 0;
57 static char argv0_buf[ARGV0_BUF_SIZE] = "btrfs";
59 const char *get_argv0_buf(void)
64 void fixup_argv0(char **argv, const char *token)
66 int len = strlen(argv0_buf);
68 snprintf(argv0_buf + len, sizeof(argv0_buf) - len, " %s", token);
72 void set_argv0(char **argv)
74 strncpy(argv0_buf, argv[0], sizeof(argv0_buf));
75 argv0_buf[sizeof(argv0_buf) - 1] = 0;
78 int check_argc_exact(int nargs, int expected)
81 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
83 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
85 return nargs != expected;
88 int check_argc_min(int nargs, int expected)
90 if (nargs < expected) {
91 fprintf(stderr, "%s: too few arguments\n", argv0_buf);
98 int check_argc_max(int nargs, int expected)
100 if (nargs > expected) {
101 fprintf(stderr, "%s: too many arguments\n", argv0_buf);
110 * Discard the given range in one go
112 static int discard_range(int fd, u64 start, u64 len)
114 u64 range[2] = { start, len };
116 if (ioctl(fd, BLKDISCARD, &range) < 0)
122 * Discard blocks in the given range in 1G chunks, the process is interruptible
124 static int discard_blocks(int fd, u64 start, u64 len)
128 u64 chunk_size = min_t(u64, len, 1*1024*1024*1024);
131 ret = discard_range(fd, start, chunk_size);
141 static u64 reference_root_table[] = {
142 [1] = BTRFS_ROOT_TREE_OBJECTID,
143 [2] = BTRFS_EXTENT_TREE_OBJECTID,
144 [3] = BTRFS_CHUNK_TREE_OBJECTID,
145 [4] = BTRFS_DEV_TREE_OBJECTID,
146 [5] = BTRFS_FS_TREE_OBJECTID,
147 [6] = BTRFS_CSUM_TREE_OBJECTID,
150 int test_uuid_unique(char *fs_uuid)
153 blkid_dev_iterate iter = NULL;
154 blkid_dev dev = NULL;
155 blkid_cache cache = NULL;
157 if (blkid_get_cache(&cache, 0) < 0) {
158 printf("ERROR: lblkid cache get failed\n");
161 blkid_probe_all(cache);
162 iter = blkid_dev_iterate_begin(cache);
163 blkid_dev_set_search(iter, "UUID", fs_uuid);
165 while (blkid_dev_next(iter, &dev) == 0) {
166 dev = blkid_verify(cache, dev);
173 blkid_dev_iterate_end(iter);
174 blkid_put_cache(cache);
180 * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
182 int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
184 struct btrfs_super_block super;
185 struct extent_buffer *buf = NULL;
186 struct btrfs_root_item root_item;
187 struct btrfs_disk_key disk_key;
188 struct btrfs_extent_item *extent_item;
189 struct btrfs_inode_item *inode_item;
190 struct btrfs_chunk *chunk;
191 struct btrfs_dev_item *dev_item;
192 struct btrfs_dev_extent *dev_extent;
193 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
203 int skinny_metadata = !!(cfg->features &
204 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
207 first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
208 first_free &= ~((u64)cfg->sectorsize - 1);
210 memset(&super, 0, sizeof(super));
212 num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
213 if (cfg->fs_uuid && *cfg->fs_uuid) {
214 if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
215 fprintf(stderr, "could not parse UUID: %s\n",
220 if (!test_uuid_unique(cfg->fs_uuid)) {
221 fprintf(stderr, "non-unique UUID: %s\n", cfg->fs_uuid);
226 uuid_generate(super.fsid);
228 uuid_unparse(super.fsid, cfg->fs_uuid);
230 uuid_generate(super.dev_item.uuid);
231 uuid_generate(chunk_tree_uuid);
233 btrfs_set_super_bytenr(&super, cfg->blocks[0]);
234 btrfs_set_super_num_devices(&super, 1);
235 btrfs_set_super_magic(&super, BTRFS_MAGIC);
236 btrfs_set_super_generation(&super, 1);
237 btrfs_set_super_root(&super, cfg->blocks[1]);
238 btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
239 btrfs_set_super_total_bytes(&super, num_bytes);
240 btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
241 btrfs_set_super_sectorsize(&super, cfg->sectorsize);
242 btrfs_set_super_leafsize(&super, cfg->nodesize);
243 btrfs_set_super_nodesize(&super, cfg->nodesize);
244 btrfs_set_super_stripesize(&super, cfg->stripesize);
245 btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
246 btrfs_set_super_chunk_root_generation(&super, 1);
247 btrfs_set_super_cache_generation(&super, -1);
248 btrfs_set_super_incompat_flags(&super, cfg->features);
250 strncpy(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
252 buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
254 /* create the tree of root objects */
255 memset(buf->data, 0, cfg->nodesize);
256 buf->len = cfg->nodesize;
257 btrfs_set_header_bytenr(buf, cfg->blocks[1]);
258 btrfs_set_header_nritems(buf, 4);
259 btrfs_set_header_generation(buf, 1);
260 btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
261 btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
262 write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
265 write_extent_buffer(buf, chunk_tree_uuid,
266 btrfs_header_chunk_tree_uuid(buf),
269 /* create the items for the root tree */
270 memset(&root_item, 0, sizeof(root_item));
271 inode_item = &root_item.inode;
272 btrfs_set_stack_inode_generation(inode_item, 1);
273 btrfs_set_stack_inode_size(inode_item, 3);
274 btrfs_set_stack_inode_nlink(inode_item, 1);
275 btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
276 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
277 btrfs_set_root_refs(&root_item, 1);
278 btrfs_set_root_used(&root_item, cfg->nodesize);
279 btrfs_set_root_generation(&root_item, 1);
281 memset(&disk_key, 0, sizeof(disk_key));
282 btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
283 btrfs_set_disk_key_offset(&disk_key, 0);
286 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
287 btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
288 btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
289 btrfs_set_item_key(buf, &disk_key, nritems);
290 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
291 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
293 write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
294 nritems), sizeof(root_item));
297 itemoff = itemoff - sizeof(root_item);
298 btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
299 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
300 btrfs_set_item_key(buf, &disk_key, nritems);
301 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
302 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
304 write_extent_buffer(buf, &root_item,
305 btrfs_item_ptr_offset(buf, nritems),
309 itemoff = itemoff - sizeof(root_item);
310 btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
311 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
312 btrfs_set_item_key(buf, &disk_key, nritems);
313 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
314 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
316 write_extent_buffer(buf, &root_item,
317 btrfs_item_ptr_offset(buf, nritems),
321 itemoff = itemoff - sizeof(root_item);
322 btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
323 btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
324 btrfs_set_item_key(buf, &disk_key, nritems);
325 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
326 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
328 write_extent_buffer(buf, &root_item,
329 btrfs_item_ptr_offset(buf, nritems),
334 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
335 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
336 if (ret != cfg->nodesize) {
337 ret = (ret < 0 ? -errno : -EIO);
341 /* create the items for the extent tree */
342 memset(buf->data + sizeof(struct btrfs_header), 0,
343 cfg->nodesize - sizeof(struct btrfs_header));
345 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
346 for (i = 1; i < 7; i++) {
347 item_size = sizeof(struct btrfs_extent_item);
348 if (!skinny_metadata)
349 item_size += sizeof(struct btrfs_tree_block_info);
351 BUG_ON(cfg->blocks[i] < first_free);
352 BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
354 /* create extent item */
355 itemoff -= item_size;
356 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
357 if (skinny_metadata) {
358 btrfs_set_disk_key_type(&disk_key,
359 BTRFS_METADATA_ITEM_KEY);
360 btrfs_set_disk_key_offset(&disk_key, 0);
362 btrfs_set_disk_key_type(&disk_key,
363 BTRFS_EXTENT_ITEM_KEY);
364 btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
366 btrfs_set_item_key(buf, &disk_key, nritems);
367 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
369 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
371 extent_item = btrfs_item_ptr(buf, nritems,
372 struct btrfs_extent_item);
373 btrfs_set_extent_refs(buf, extent_item, 1);
374 btrfs_set_extent_generation(buf, extent_item, 1);
375 btrfs_set_extent_flags(buf, extent_item,
376 BTRFS_EXTENT_FLAG_TREE_BLOCK);
379 /* create extent ref */
380 ref_root = reference_root_table[i];
381 btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
382 btrfs_set_disk_key_offset(&disk_key, ref_root);
383 btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
384 btrfs_set_item_key(buf, &disk_key, nritems);
385 btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
387 btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
390 btrfs_set_header_bytenr(buf, cfg->blocks[2]);
391 btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
392 btrfs_set_header_nritems(buf, nritems);
393 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
394 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
395 if (ret != cfg->nodesize) {
396 ret = (ret < 0 ? -errno : -EIO);
400 /* create the chunk tree */
401 memset(buf->data + sizeof(struct btrfs_header), 0,
402 cfg->nodesize - sizeof(struct btrfs_header));
404 item_size = sizeof(*dev_item);
405 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
407 /* first device 1 (there is no device 0) */
408 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
409 btrfs_set_disk_key_offset(&disk_key, 1);
410 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
411 btrfs_set_item_key(buf, &disk_key, nritems);
412 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
413 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
415 dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
416 btrfs_set_device_id(buf, dev_item, 1);
417 btrfs_set_device_generation(buf, dev_item, 0);
418 btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
419 btrfs_set_device_bytes_used(buf, dev_item,
420 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
421 btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
422 btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
423 btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
424 btrfs_set_device_type(buf, dev_item, 0);
426 write_extent_buffer(buf, super.dev_item.uuid,
427 (unsigned long)btrfs_device_uuid(dev_item),
429 write_extent_buffer(buf, super.fsid,
430 (unsigned long)btrfs_device_fsid(dev_item),
432 read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
436 item_size = btrfs_chunk_item_size(1);
437 itemoff = itemoff - item_size;
439 /* then we have chunk 0 */
440 btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
441 btrfs_set_disk_key_offset(&disk_key, 0);
442 btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
443 btrfs_set_item_key(buf, &disk_key, nritems);
444 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
445 btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
447 chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
448 btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
449 btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
450 btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
451 btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
452 btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
453 btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
454 btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
455 btrfs_set_chunk_num_stripes(buf, chunk, 1);
456 btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
457 btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
460 write_extent_buffer(buf, super.dev_item.uuid,
461 (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
464 /* copy the key for the chunk to the system array */
465 ptr = super.sys_chunk_array;
466 array_size = sizeof(disk_key);
468 memcpy(ptr, &disk_key, sizeof(disk_key));
469 ptr += sizeof(disk_key);
471 /* copy the chunk to the system array */
472 read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
473 array_size += item_size;
475 btrfs_set_super_sys_array_size(&super, array_size);
477 btrfs_set_header_bytenr(buf, cfg->blocks[3]);
478 btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
479 btrfs_set_header_nritems(buf, nritems);
480 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
481 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
482 if (ret != cfg->nodesize) {
483 ret = (ret < 0 ? -errno : -EIO);
487 /* create the device tree */
488 memset(buf->data + sizeof(struct btrfs_header), 0,
489 cfg->nodesize - sizeof(struct btrfs_header));
491 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
492 sizeof(struct btrfs_dev_extent);
494 btrfs_set_disk_key_objectid(&disk_key, 1);
495 btrfs_set_disk_key_offset(&disk_key, 0);
496 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
497 btrfs_set_item_key(buf, &disk_key, nritems);
498 btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
499 btrfs_set_item_size(buf, btrfs_item_nr(nritems),
500 sizeof(struct btrfs_dev_extent));
501 dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
502 btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
503 BTRFS_CHUNK_TREE_OBJECTID);
504 btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
505 BTRFS_FIRST_CHUNK_TREE_OBJECTID);
506 btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
508 write_extent_buffer(buf, chunk_tree_uuid,
509 (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
512 btrfs_set_dev_extent_length(buf, dev_extent,
513 BTRFS_MKFS_SYSTEM_GROUP_SIZE);
516 btrfs_set_header_bytenr(buf, cfg->blocks[4]);
517 btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
518 btrfs_set_header_nritems(buf, nritems);
519 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
520 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
521 if (ret != cfg->nodesize) {
522 ret = (ret < 0 ? -errno : -EIO);
526 /* create the FS root */
527 memset(buf->data + sizeof(struct btrfs_header), 0,
528 cfg->nodesize - sizeof(struct btrfs_header));
529 btrfs_set_header_bytenr(buf, cfg->blocks[5]);
530 btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
531 btrfs_set_header_nritems(buf, 0);
532 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
533 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
534 if (ret != cfg->nodesize) {
535 ret = (ret < 0 ? -errno : -EIO);
538 /* finally create the csum root */
539 memset(buf->data + sizeof(struct btrfs_header), 0,
540 cfg->nodesize - sizeof(struct btrfs_header));
541 btrfs_set_header_bytenr(buf, cfg->blocks[6]);
542 btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
543 btrfs_set_header_nritems(buf, 0);
544 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
545 ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
546 if (ret != cfg->nodesize) {
547 ret = (ret < 0 ? -errno : -EIO);
551 /* and write out the super block */
552 BUG_ON(sizeof(super) > cfg->sectorsize);
553 memset(buf->data, 0, cfg->sectorsize);
554 memcpy(buf->data, &super, sizeof(super));
555 buf->len = cfg->sectorsize;
556 csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
557 ret = pwrite(fd, buf->data, cfg->sectorsize, cfg->blocks[0]);
558 if (ret != cfg->sectorsize) {
559 ret = (ret < 0 ? -errno : -EIO);
570 static const struct btrfs_fs_feature {
574 } mkfs_features[] = {
575 { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
576 "mixed data and metadata block groups" },
577 { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
578 "increased hardlink limit per file to 65536" },
579 { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
580 "raid56 extended format" },
581 { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
582 "reduced-size metadata extent refs" },
583 { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
584 "no explicit hole extents for files" },
585 /* Keep this one last */
586 { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
589 static int parse_one_fs_feature(const char *name, u64 *flags)
594 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
595 if (name[0] == '^' &&
596 !strcmp(mkfs_features[i].name, name + 1)) {
597 *flags &= ~ mkfs_features[i].flag;
599 } else if (!strcmp(mkfs_features[i].name, name)) {
600 *flags |= mkfs_features[i].flag;
608 void btrfs_parse_features_to_string(char *buf, u64 flags)
614 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
615 if (flags & mkfs_features[i].flag) {
618 strcat(buf, mkfs_features[i].name);
623 void btrfs_process_fs_features(u64 flags)
627 for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
628 if (flags & mkfs_features[i].flag) {
629 printf("Turning ON incompat feature '%s': %s\n",
630 mkfs_features[i].name,
631 mkfs_features[i].desc);
636 void btrfs_list_all_fs_features(u64 mask_disallowed)
640 fprintf(stderr, "Filesystem features available:\n");
641 for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
642 char *is_default = "";
644 if (mkfs_features[i].flag & mask_disallowed)
646 if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
647 is_default = ", default";
648 fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
649 mkfs_features[i].name,
650 mkfs_features[i].desc,
651 mkfs_features[i].flag,
657 * Return NULL if all features were parsed fine, otherwise return the name of
658 * the first unparsed.
660 char* btrfs_parse_fs_features(char *namelist, u64 *flags)
663 char *save_ptr = NULL; /* Satisfy static checkers */
665 for (this_char = strtok_r(namelist, ",", &save_ptr);
667 this_char = strtok_r(NULL, ",", &save_ptr)) {
668 if (parse_one_fs_feature(this_char, flags))
675 u64 btrfs_device_size(int fd, struct stat *st)
678 if (S_ISREG(st->st_mode)) {
681 if (!S_ISBLK(st->st_mode)) {
684 if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
690 static int zero_blocks(int fd, off_t start, size_t len)
692 char *buf = malloc(len);
699 written = pwrite(fd, buf, len, start);
706 #define ZERO_DEV_BYTES (2 * 1024 * 1024)
708 /* don't write outside the device by clamping the region to the device size */
709 static int zero_dev_clamped(int fd, off_t start, ssize_t len, u64 dev_size)
711 off_t end = max(start, start + len);
714 /* and don't overwrite the disk labels on sparc */
715 start = max(start, 1024);
716 end = max(end, 1024);
719 start = min_t(u64, start, dev_size);
720 end = min_t(u64, end, dev_size);
722 return zero_blocks(fd, start, end - start);
725 int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
726 struct btrfs_root *root, int fd, char *path,
727 u64 block_count, u32 io_width, u32 io_align,
730 struct btrfs_super_block *disk_super;
731 struct btrfs_super_block *super = root->fs_info->super_copy;
732 struct btrfs_device *device;
733 struct btrfs_dev_item *dev_item;
739 device = kzalloc(sizeof(*device), GFP_NOFS);
742 buf = kmalloc(sectorsize, GFP_NOFS);
747 BUG_ON(sizeof(*disk_super) > sectorsize);
748 memset(buf, 0, sectorsize);
750 disk_super = (struct btrfs_super_block *)buf;
751 dev_item = &disk_super->dev_item;
753 uuid_generate(device->uuid);
756 device->io_width = io_width;
757 device->io_align = io_align;
758 device->sector_size = sectorsize;
760 device->writeable = 1;
761 device->total_bytes = block_count;
762 device->bytes_used = 0;
763 device->total_ios = 0;
764 device->dev_root = root->fs_info->dev_root;
765 device->name = strdup(path);
767 ret = btrfs_add_device(trans, root, device);
770 total_bytes = btrfs_super_total_bytes(super) + block_count;
771 btrfs_set_super_total_bytes(super, total_bytes);
773 num_devs = btrfs_super_num_devices(super) + 1;
774 btrfs_set_super_num_devices(super, num_devs);
776 memcpy(disk_super, super, sizeof(*disk_super));
778 btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
779 btrfs_set_stack_device_id(dev_item, device->devid);
780 btrfs_set_stack_device_type(dev_item, device->type);
781 btrfs_set_stack_device_io_align(dev_item, device->io_align);
782 btrfs_set_stack_device_io_width(dev_item, device->io_width);
783 btrfs_set_stack_device_sector_size(dev_item, device->sector_size);
784 btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes);
785 btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used);
786 memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE);
788 ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET);
789 BUG_ON(ret != sectorsize);
792 list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
793 device->fs_devices = root->fs_info->fs_devices;
797 static void btrfs_wipe_existing_sb(int fd)
799 const char *off = NULL;
804 blkid_probe pr = NULL;
806 pr = blkid_new_probe();
810 if (blkid_probe_set_device(pr, fd, 0, 0))
813 rc = blkid_probe_lookup_value(pr, "SBMAGIC_OFFSET", &off, NULL);
815 rc = blkid_probe_lookup_value(pr, "SBMAGIC", NULL, &len);
817 if (rc || len == 0 || off == NULL)
820 offset = strtoll(off, NULL, 10);
821 if (len > sizeof(buf))
825 rc = pwrite(fd, buf, len, offset);
829 blkid_free_probe(pr);
833 int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
834 u64 max_block_count, int *mixed, int discard)
840 ret = fstat(fd, &st);
842 fprintf(stderr, "unable to stat %s\n", file);
846 block_count = btrfs_device_size(fd, &st);
847 if (block_count == 0) {
848 fprintf(stderr, "unable to find %s size\n", file);
852 block_count = min(block_count, max_block_count);
854 if (block_count < BTRFS_MKFS_SMALL_VOLUME_SIZE && !(*mixed))
859 * We intentionally ignore errors from the discard ioctl. It
860 * is not necessary for the mkfs functionality but just an
863 if (discard_range(fd, 0, 0) == 0) {
864 printf("Performing full device TRIM (%s) ...\n",
865 pretty_size(block_count));
866 discard_blocks(fd, 0, block_count);
870 ret = zero_dev_clamped(fd, 0, ZERO_DEV_BYTES, block_count);
871 for (i = 0 ; !ret && i < BTRFS_SUPER_MIRROR_MAX; i++)
872 ret = zero_dev_clamped(fd, btrfs_sb_offset(i),
873 BTRFS_SUPER_INFO_SIZE, block_count);
874 if (!ret && zero_end)
875 ret = zero_dev_clamped(fd, block_count - ZERO_DEV_BYTES,
876 ZERO_DEV_BYTES, block_count);
879 fprintf(stderr, "ERROR: failed to zero device '%s' - %s\n",
880 file, strerror(-ret));
884 btrfs_wipe_existing_sb(fd);
886 *block_count_ret = block_count;
890 int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
891 struct btrfs_root *root, u64 objectid)
894 struct btrfs_inode_item inode_item;
895 time_t now = time(NULL);
897 memset(&inode_item, 0, sizeof(inode_item));
898 btrfs_set_stack_inode_generation(&inode_item, trans->transid);
899 btrfs_set_stack_inode_size(&inode_item, 0);
900 btrfs_set_stack_inode_nlink(&inode_item, 1);
901 btrfs_set_stack_inode_nbytes(&inode_item, root->nodesize);
902 btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0755);
903 btrfs_set_stack_timespec_sec(&inode_item.atime, now);
904 btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
905 btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
906 btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
907 btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
908 btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
909 btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
910 btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
912 if (root->fs_info->tree_root == root)
913 btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
915 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
919 ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0);
923 btrfs_set_root_dirid(&root->root_item, objectid);
930 * checks if a path is a block device node
931 * Returns negative errno on failure, otherwise
932 * returns 1 for blockdev, 0 for not-blockdev
934 int is_block_device(const char *path)
938 if (stat(path, &statbuf) < 0)
941 return S_ISBLK(statbuf.st_mode);
945 * check if given path is a mount point
946 * return 1 if yes. 0 if no. -1 for error
948 int is_mount_point(const char *path)
954 f = setmntent("/proc/self/mounts", "r");
958 while ((mnt = getmntent(f)) != NULL) {
959 if (strcmp(mnt->mnt_dir, path))
968 static int is_reg_file(const char *path)
972 if (stat(path, &statbuf) < 0)
974 return S_ISREG(statbuf.st_mode);
978 * This function checks if the given input parameter is
980 * return <0 : some error in the given input
981 * return BTRFS_ARG_UNKNOWN: unknown input
982 * return BTRFS_ARG_UUID: given input is uuid
983 * return BTRFS_ARG_MNTPOINT: given input is path
984 * return BTRFS_ARG_REG: given input is regular file
986 int check_arg_type(const char *input)
994 if (realpath(input, path)) {
995 if (is_block_device(path) == 1)
996 return BTRFS_ARG_BLKDEV;
998 if (is_mount_point(path) == 1)
999 return BTRFS_ARG_MNTPOINT;
1001 if (is_reg_file(path))
1002 return BTRFS_ARG_REG;
1004 return BTRFS_ARG_UNKNOWN;
1007 if (strlen(input) == (BTRFS_UUID_UNPARSED_SIZE - 1) &&
1008 !uuid_parse(input, uuid))
1009 return BTRFS_ARG_UUID;
1011 return BTRFS_ARG_UNKNOWN;
1015 * Find the mount point for a mounted device.
1016 * On success, returns 0 with mountpoint in *mp.
1017 * On failure, returns -errno (not mounted yields -EINVAL)
1018 * Is noisy on failures, expects to be given a mounted device.
1020 int get_btrfs_mount(const char *dev, char *mp, size_t mp_size)
1025 ret = is_block_device(dev);
1028 fprintf(stderr, "%s is not a block device\n", dev);
1031 fprintf(stderr, "Could not check %s: %s\n",
1032 dev, strerror(-ret));
1037 fd = open(dev, O_RDONLY);
1040 fprintf(stderr, "Could not open %s: %s\n", dev, strerror(errno));
1044 ret = check_mounted_where(fd, dev, mp, mp_size, NULL);
1047 } else { /* mounted, all good */
1057 * Given a pathname, return a filehandle to:
1058 * the original pathname or,
1059 * if the pathname is a mounted btrfs device, to its mountpoint.
1061 * On error, return -1, errno should be set.
1063 int open_path_or_dev_mnt(const char *path, DIR **dirstream)
1068 if (is_block_device(path)) {
1071 ret = get_btrfs_mount(path, mp, sizeof(mp));
1073 /* not a mounted btrfs dev */
1077 fdmnt = open_file_or_dir(mp, dirstream);
1079 fdmnt = open_file_or_dir(path, dirstream);
1086 * Do the following checks before calling open_file_or_dir():
1087 * 1: path is in a btrfs filesystem
1088 * 2: path is a directory
1090 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
1096 if (statfs(path, &stfs) != 0) {
1099 "ERROR: can't access '%s': %s\n",
1100 path, strerror(errno));
1104 if (stfs.f_type != BTRFS_SUPER_MAGIC) {
1107 "ERROR: not a btrfs filesystem: %s\n",
1112 if (stat(path, &st) != 0) {
1115 "ERROR: can't access '%s': %s\n",
1116 path, strerror(errno));
1120 if (!S_ISDIR(st.st_mode)) {
1123 "ERROR: not a directory: %s\n",
1128 ret = open_file_or_dir(path, dirstream);
1132 "ERROR: can't access '%s': %s\n",
1133 path, strerror(errno));
1139 /* checks if a device is a loop device */
1140 static int is_loop_device (const char* device) {
1141 struct stat statbuf;
1143 if(stat(device, &statbuf) < 0)
1146 return (S_ISBLK(statbuf.st_mode) &&
1147 MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
1151 /* Takes a loop device path (e.g. /dev/loop0) and returns
1152 * the associated file (e.g. /images/my_btrfs.img) */
1153 static int resolve_loop_device(const char* loop_dev, char* loop_file,
1160 char real_loop_dev[PATH_MAX];
1162 if (!realpath(loop_dev, real_loop_dev))
1164 snprintf(p, PATH_MAX, "/sys/block/%s/loop/backing_file", strrchr(real_loop_dev, '/'));
1165 if (!(f = fopen(p, "r")))
1168 snprintf(fmt, 20, "%%%i[^\n]", max_len-1);
1169 ret = fscanf(f, fmt, loop_file);
1178 * Checks whether a and b are identical or device
1179 * files associated with the same block device
1181 static int is_same_blk_file(const char* a, const char* b)
1183 struct stat st_buf_a, st_buf_b;
1184 char real_a[PATH_MAX];
1185 char real_b[PATH_MAX];
1187 if (!realpath(a, real_a))
1188 strncpy_null(real_a, a);
1190 if (!realpath(b, real_b))
1191 strncpy_null(real_b, b);
1193 /* Identical path? */
1194 if (strcmp(real_a, real_b) == 0)
1197 if (stat(a, &st_buf_a) < 0 || stat(b, &st_buf_b) < 0) {
1198 if (errno == ENOENT)
1203 /* Same blockdevice? */
1204 if (S_ISBLK(st_buf_a.st_mode) && S_ISBLK(st_buf_b.st_mode) &&
1205 st_buf_a.st_rdev == st_buf_b.st_rdev) {
1210 if (st_buf_a.st_dev == st_buf_b.st_dev &&
1211 st_buf_a.st_ino == st_buf_b.st_ino) {
1218 /* checks if a and b are identical or device
1219 * files associated with the same block device or
1220 * if one file is a loop device that uses the other
1223 static int is_same_loop_file(const char* a, const char* b)
1225 char res_a[PATH_MAX];
1226 char res_b[PATH_MAX];
1227 const char* final_a = NULL;
1228 const char* final_b = NULL;
1231 /* Resolve a if it is a loop device */
1232 if((ret = is_loop_device(a)) < 0) {
1237 ret = resolve_loop_device(a, res_a, sizeof(res_a));
1248 /* Resolve b if it is a loop device */
1249 if ((ret = is_loop_device(b)) < 0) {
1254 ret = resolve_loop_device(b, res_b, sizeof(res_b));
1265 return is_same_blk_file(final_a, final_b);
1268 /* Checks if a file exists and is a block or regular file*/
1269 static int is_existing_blk_or_reg_file(const char* filename)
1273 if(stat(filename, &st_buf) < 0) {
1280 return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
1283 /* Checks if a file is used (directly or indirectly via a loop device)
1284 * by a device in fs_devices
1286 static int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices,
1290 struct list_head *head;
1291 struct list_head *cur;
1292 struct btrfs_device *device;
1294 head = &fs_devices->devices;
1295 list_for_each(cur, head) {
1296 device = list_entry(cur, struct btrfs_device, dev_list);
1298 if((ret = is_same_loop_file(device->name, file)))
1306 * Resolve a pathname to a device mapper node to /dev/mapper/<name>
1307 * Returns NULL on invalid input or malloc failure; Other failures
1308 * will be handled by the caller using the input pathame.
1310 char *canonicalize_dm_name(const char *ptname)
1314 char path[PATH_MAX], name[PATH_MAX], *res = NULL;
1316 if (!ptname || !*ptname)
1319 snprintf(path, sizeof(path), "/sys/block/%s/dm/name", ptname);
1320 if (!(f = fopen(path, "r")))
1323 /* read <name>\n from sysfs */
1324 if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
1325 name[sz - 1] = '\0';
1326 snprintf(path, sizeof(path), "/dev/mapper/%s", name);
1328 if (access(path, F_OK) == 0)
1336 * Resolve a pathname to a canonical device node, e.g. /dev/sda1 or
1337 * to a device mapper pathname.
1338 * Returns NULL on invalid input or malloc failure; Other failures
1339 * will be handled by the caller using the input pathame.
1341 char *canonicalize_path(const char *path)
1343 char *canonical, *p;
1345 if (!path || !*path)
1348 canonical = realpath(path, NULL);
1350 return strdup(path);
1351 p = strrchr(canonical, '/');
1352 if (p && strncmp(p, "/dm-", 4) == 0 && isdigit(*(p + 4))) {
1353 char *dm = canonicalize_dm_name(p + 1);
1364 * returns 1 if the device was mounted, < 0 on error or 0 if everything
1365 * is safe to continue.
1367 int check_mounted(const char* file)
1372 fd = open(file, O_RDONLY);
1374 fprintf (stderr, "check_mounted(): Could not open %s\n", file);
1378 ret = check_mounted_where(fd, file, NULL, 0, NULL);
1384 int check_mounted_where(int fd, const char *file, char *where, int size,
1385 struct btrfs_fs_devices **fs_dev_ret)
1390 struct btrfs_fs_devices *fs_devices_mnt = NULL;
1394 /* scan the initial device */
1395 ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
1396 &total_devs, BTRFS_SUPER_INFO_OFFSET, 0);
1397 is_btrfs = (ret >= 0);
1399 /* scan other devices */
1400 if (is_btrfs && total_devs > 1) {
1401 ret = btrfs_scan_lblkid();
1406 /* iterate over the list of currently mountes filesystems */
1407 if ((f = setmntent ("/proc/self/mounts", "r")) == NULL)
1410 while ((mnt = getmntent (f)) != NULL) {
1412 if(strcmp(mnt->mnt_type, "btrfs") != 0)
1415 ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
1417 /* ignore entries in the mount table that are not
1418 associated with a file*/
1419 if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
1420 goto out_mntloop_err;
1424 ret = is_same_loop_file(file, mnt->mnt_fsname);
1428 goto out_mntloop_err;
1433 /* Did we find an entry in mnt table? */
1434 if (mnt && size && where) {
1435 strncpy(where, mnt->mnt_dir, size);
1439 *fs_dev_ret = fs_devices_mnt;
1441 ret = (mnt != NULL);
1449 struct pending_dir {
1450 struct list_head list;
1451 char name[PATH_MAX];
1454 int btrfs_register_one_device(const char *fname)
1456 struct btrfs_ioctl_vol_args args;
1461 fd = open("/dev/btrfs-control", O_RDWR);
1463 fprintf(stderr, "failed to open /dev/btrfs-control "
1464 "skipping device registration: %s\n",
1468 memset(&args, 0, sizeof(args));
1469 strncpy_null(args.name, fname);
1470 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
1473 fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
1474 fname, strerror(e));
1482 * Register all devices in the fs_uuid list created in the user
1483 * space. Ensure btrfs_scan_lblkid() is called before this func.
1485 int btrfs_register_all_devices(void)
1488 struct btrfs_fs_devices *fs_devices;
1489 struct btrfs_device *device;
1490 struct list_head *all_uuids;
1492 all_uuids = btrfs_scanned_uuids();
1494 list_for_each_entry(fs_devices, all_uuids, list) {
1495 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1496 if (strlen(device->name) != 0) {
1497 err = btrfs_register_one_device(device->name);
1508 int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
1511 struct btrfs_super_block *disk_super;
1515 buf = malloc(BTRFS_SUPER_INFO_SIZE);
1520 ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset);
1521 if (ret != BTRFS_SUPER_INFO_SIZE)
1525 disk_super = (struct btrfs_super_block *)buf;
1526 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC)
1529 if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
1539 * Note: this function uses a static per-thread buffer. Do not call this
1540 * function more than 10 times within one argument list!
1542 const char *pretty_size_mode(u64 size, unsigned mode)
1544 static __thread int ps_index = 0;
1545 static __thread char ps_array[10][32];
1548 ret = ps_array[ps_index];
1551 (void)pretty_size_snprintf(size, ret, 32, mode);
1556 static const char* unit_suffix_binary[] =
1557 { "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"};
1558 static const char* unit_suffix_decimal[] =
1559 { "B", "kB", "MB", "GB", "TB", "PB", "EB"};
1561 int pretty_size_snprintf(u64 size, char *str, size_t str_size, unsigned unit_mode)
1567 const char** suffix = NULL;
1573 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_RAW) {
1574 snprintf(str, str_size, "%llu", size);
1578 if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_BINARY) {
1581 suffix = unit_suffix_binary;
1582 } else if ((unit_mode & ~UNITS_MODE_MASK) == UNITS_DECIMAL) {
1585 suffix = unit_suffix_decimal;
1590 fprintf(stderr, "INTERNAL ERROR: unknown unit base, mode %d\n",
1598 switch (unit_mode & UNITS_MODE_MASK) {
1599 case UNITS_TBYTES: base *= mult; num_divs++;
1600 case UNITS_GBYTES: base *= mult; num_divs++;
1601 case UNITS_MBYTES: base *= mult; num_divs++;
1602 case UNITS_KBYTES: num_divs++;
1609 while (size >= mult) {
1616 if (num_divs >= ARRAY_SIZE(unit_suffix_binary)) {
1618 printf("INTERNAL ERROR: unsupported unit suffix, index %d\n",
1623 fraction = (float)last_size / base;
1625 return snprintf(str, str_size, "%.2f%s", fraction, suffix[num_divs]);
1629 * __strncpy__null - strncpy with null termination
1630 * @dest: the target array
1631 * @src: the source string
1632 * @n: maximum bytes to copy (size of *dest)
1634 * Like strncpy, but ensures destination is null-terminated.
1636 * Copies the string pointed to by src, including the terminating null
1637 * byte ('\0'), to the buffer pointed to by dest, up to a maximum
1638 * of n bytes. Then ensure that dest is null-terminated.
1640 char *__strncpy__null(char *dest, const char *src, size_t n)
1642 strncpy(dest, src, n);
1649 * Checks to make sure that the label matches our requirements.
1651 0 if everything is safe and usable
1652 -1 if the label is too long
1654 static int check_label(const char *input)
1656 int len = strlen(input);
1658 if (len > BTRFS_LABEL_SIZE - 1) {
1659 fprintf(stderr, "ERROR: Label %s is too long (max %d)\n",
1660 input, BTRFS_LABEL_SIZE - 1);
1667 static int set_label_unmounted(const char *dev, const char *label)
1669 struct btrfs_trans_handle *trans;
1670 struct btrfs_root *root;
1673 ret = check_mounted(dev);
1675 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1679 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1684 /* Open the super_block at the default location
1685 * and as read-write.
1687 root = open_ctree(dev, 0, OPEN_CTREE_WRITES);
1688 if (!root) /* errors are printed by open_ctree() */
1691 trans = btrfs_start_transaction(root, 1);
1692 snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
1694 btrfs_commit_transaction(trans, root);
1696 /* Now we close it since we are done. */
1701 static int set_label_mounted(const char *mount_path, const char *label)
1705 fd = open(mount_path, O_RDONLY | O_NOATIME);
1707 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1711 if (ioctl(fd, BTRFS_IOC_SET_FSLABEL, label) < 0) {
1712 fprintf(stderr, "ERROR: unable to set label %s\n",
1722 static int get_label_unmounted(const char *dev, char *label)
1724 struct btrfs_root *root;
1727 ret = check_mounted(dev);
1729 fprintf(stderr, "FATAL: error checking %s mount status\n", dev);
1733 fprintf(stderr, "ERROR: dev %s is mounted, use mount point\n",
1738 /* Open the super_block at the default location
1741 root = open_ctree(dev, 0, 0);
1745 memcpy(label, root->fs_info->super_copy->label, BTRFS_LABEL_SIZE);
1747 /* Now we close it since we are done. */
1753 * If a partition is mounted, try to get the filesystem label via its
1754 * mounted path rather than device. Return the corresponding error
1755 * the user specified the device path.
1757 int get_label_mounted(const char *mount_path, char *labelp)
1759 char label[BTRFS_LABEL_SIZE];
1762 fd = open(mount_path, O_RDONLY | O_NOATIME);
1764 fprintf(stderr, "ERROR: unable to access '%s'\n", mount_path);
1768 memset(label, '\0', sizeof(label));
1769 if (ioctl(fd, BTRFS_IOC_GET_FSLABEL, label) < 0) {
1770 fprintf(stderr, "ERROR: unable get label %s\n", strerror(errno));
1775 strncpy(labelp, label, sizeof(label));
1780 int get_label(const char *btrfs_dev, char *label)
1784 ret = is_existing_blk_or_reg_file(btrfs_dev);
1786 ret = get_label_mounted(btrfs_dev, label);
1788 ret = get_label_unmounted(btrfs_dev, label);
1793 int set_label(const char *btrfs_dev, const char *label)
1797 if (check_label(label))
1800 ret = is_existing_blk_or_reg_file(btrfs_dev);
1802 ret = set_label_mounted(btrfs_dev, label);
1804 ret = set_label_unmounted(btrfs_dev, label);
1810 * Unsafe subvolume check.
1812 * This only checks ino == BTRFS_FIRST_FREE_OBJECTID, even it is not in a
1813 * btrfs mount point.
1814 * Must use together with other reliable method like btrfs ioctl.
1816 static int __is_subvol(const char *path)
1821 ret = lstat(path, &st);
1825 return st.st_ino == BTRFS_FIRST_FREE_OBJECTID;
1829 * A not-so-good version fls64. No fascinating optimization since
1830 * no one except parse_size use it
1832 static int fls64(u64 x)
1836 for (i = 0; i <64; i++)
1837 if (x << i & (1ULL << 63))
1842 u64 parse_size(char *s)
1850 fprintf(stderr, "ERROR: Size value is empty\n");
1855 "ERROR: Size value '%s' is less equal than 0\n", s);
1858 ret = strtoull(s, &endptr, 10);
1860 fprintf(stderr, "ERROR: Size value '%s' is invalid\n", s);
1863 if (endptr[0] && endptr[1]) {
1864 fprintf(stderr, "ERROR: Illegal suffix contains character '%c' in wrong position\n",
1869 * strtoll returns LLONG_MAX when overflow, if this happens,
1870 * need to call strtoull to get the real size
1872 if (errno == ERANGE && ret == ULLONG_MAX) {
1874 "ERROR: Size value '%s' is too large for u64\n", s);
1878 c = tolower(endptr[0]);
1901 fprintf(stderr, "ERROR: Unknown size descriptor '%c'\n",
1906 /* Check whether ret * mult overflow */
1907 if (fls64(ret) + fls64(mult) - 1 > 64) {
1909 "ERROR: Size value '%s' is too large for u64\n", s);
1916 u64 parse_qgroupid(const char *p)
1918 char *s = strchr(p, '/');
1919 const char *ptr_src_end = p + strlen(p);
1920 char *ptr_parse_end = NULL;
1929 /* Numeric format like '0/257' is the primary case */
1931 id = strtoull(p, &ptr_parse_end, 10);
1932 if (ptr_parse_end != ptr_src_end)
1936 level = strtoull(p, &ptr_parse_end, 10);
1937 if (ptr_parse_end != s)
1940 id = strtoull(s + 1, &ptr_parse_end, 10);
1941 if (ptr_parse_end != ptr_src_end)
1944 return (level << BTRFS_QGROUP_LEVEL_SHIFT) | id;
1947 /* Path format like subv at 'my_subvol' is the fallback case */
1948 ret = __is_subvol(p);
1949 if (ret < 0 || !ret)
1951 fd = open(p, O_RDONLY);
1954 ret = lookup_ino_rootid(fd, &id);
1961 fprintf(stderr, "ERROR: invalid qgroupid or subvolume path: %s\n", p);
1965 int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags)
1971 ret = stat(fname, &st);
1975 if (S_ISDIR(st.st_mode)) {
1976 *dirstream = opendir(fname);
1979 fd = dirfd(*dirstream);
1980 } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
1981 fd = open(fname, open_flags);
1984 * we set this on purpose, in case the caller output
1985 * strerror(errno) as success
1993 closedir(*dirstream);
2000 int open_file_or_dir(const char *fname, DIR **dirstream)
2002 return open_file_or_dir3(fname, dirstream, O_RDWR);
2005 void close_file_or_dir(int fd, DIR *dirstream)
2008 closedir(dirstream);
2013 int get_device_info(int fd, u64 devid,
2014 struct btrfs_ioctl_dev_info_args *di_args)
2018 di_args->devid = devid;
2019 memset(&di_args->uuid, '\0', sizeof(di_args->uuid));
2021 ret = ioctl(fd, BTRFS_IOC_DEV_INFO, di_args);
2022 return ret ? -errno : 0;
2025 static u64 find_max_device_id(struct btrfs_ioctl_search_args *search_args,
2028 struct btrfs_dev_item *dev_item;
2029 char *buf = search_args->buf;
2031 buf += (nr_items - 1) * (sizeof(struct btrfs_ioctl_search_header)
2032 + sizeof(struct btrfs_dev_item));
2033 buf += sizeof(struct btrfs_ioctl_search_header);
2035 dev_item = (struct btrfs_dev_item *)buf;
2037 return btrfs_stack_device_id(dev_item);
2040 static int search_chunk_tree_for_fs_info(int fd,
2041 struct btrfs_ioctl_fs_info_args *fi_args)
2045 u64 start_devid = 1;
2046 struct btrfs_ioctl_search_args search_args;
2047 struct btrfs_ioctl_search_key *search_key = &search_args.key;
2049 fi_args->num_devices = 0;
2051 max_items = BTRFS_SEARCH_ARGS_BUFSIZE
2052 / (sizeof(struct btrfs_ioctl_search_header)
2053 + sizeof(struct btrfs_dev_item));
2055 search_key->tree_id = BTRFS_CHUNK_TREE_OBJECTID;
2056 search_key->min_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2057 search_key->max_objectid = BTRFS_DEV_ITEMS_OBJECTID;
2058 search_key->min_type = BTRFS_DEV_ITEM_KEY;
2059 search_key->max_type = BTRFS_DEV_ITEM_KEY;
2060 search_key->min_transid = 0;
2061 search_key->max_transid = (u64)-1;
2062 search_key->nr_items = max_items;
2063 search_key->max_offset = (u64)-1;
2066 search_key->min_offset = start_devid;
2068 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_args);
2072 fi_args->num_devices += (u64)search_key->nr_items;
2074 if (search_key->nr_items == max_items) {
2075 start_devid = find_max_device_id(&search_args,
2076 search_key->nr_items) + 1;
2080 /* get the lastest max_id to stay consistent with the num_devices */
2081 if (search_key->nr_items == 0)
2083 * last tree_search returns an empty buf, use the devid of
2084 * the last dev_item of the previous tree_search
2086 fi_args->max_id = start_devid - 1;
2088 fi_args->max_id = find_max_device_id(&search_args,
2089 search_key->nr_items);
2095 * For a given path, fill in the ioctl fs_ and info_ args.
2096 * If the path is a btrfs mountpoint, fill info for all devices.
2097 * If the path is a btrfs device, fill in only that device.
2099 * The path provided must be either on a mounted btrfs fs,
2100 * or be a mounted btrfs device.
2102 * Returns 0 on success, or a negative errno.
2104 int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
2105 struct btrfs_ioctl_dev_info_args **di_ret)
2112 struct btrfs_fs_devices *fs_devices_mnt = NULL;
2113 struct btrfs_ioctl_dev_info_args *di_args;
2114 struct btrfs_ioctl_dev_info_args tmp;
2116 DIR *dirstream = NULL;
2118 memset(fi_args, 0, sizeof(*fi_args));
2120 if (is_block_device(path)) {
2121 struct btrfs_super_block *disk_super;
2122 char buf[BTRFS_SUPER_INFO_SIZE];
2125 /* Ensure it's mounted, then set path to the mountpoint */
2126 fd = open(path, O_RDONLY);
2129 fprintf(stderr, "Couldn't open %s: %s\n",
2130 path, strerror(errno));
2133 ret = check_mounted_where(fd, path, mp, sizeof(mp),
2142 /* Only fill in this one device */
2143 fi_args->num_devices = 1;
2145 disk_super = (struct btrfs_super_block *)buf;
2146 ret = btrfs_read_dev_super(fd, disk_super,
2147 BTRFS_SUPER_INFO_OFFSET, 0);
2152 devid = btrfs_stack_device_id(&disk_super->dev_item);
2154 fi_args->max_id = devid;
2157 memcpy(fi_args->fsid, fs_devices_mnt->fsid, BTRFS_FSID_SIZE);
2161 /* at this point path must not be for a block device */
2162 fd = open_file_or_dir(path, &dirstream);
2168 /* fill in fi_args if not just a single device */
2169 if (fi_args->num_devices != 1) {
2170 ret = ioctl(fd, BTRFS_IOC_FS_INFO, fi_args);
2177 * The fs_args->num_devices does not include seed devices
2179 ret = search_chunk_tree_for_fs_info(fd, fi_args);
2184 * search_chunk_tree_for_fs_info() will lacks the devid 0
2185 * so manual probe for it here.
2187 ret = get_device_info(fd, 0, &tmp);
2189 fi_args->num_devices++;
2197 if (!fi_args->num_devices)
2200 di_args = *di_ret = malloc((fi_args->num_devices) * sizeof(*di_args));
2207 memcpy(di_args, &tmp, sizeof(tmp));
2208 for (; i <= fi_args->max_id; ++i) {
2209 ret = get_device_info(fd, i, &di_args[ndevs]);
2218 * only when the only dev we wanted to find is not there then
2219 * let any error be returned
2221 if (fi_args->num_devices != 1) {
2227 close_file_or_dir(fd, dirstream);
2231 #define isoctal(c) (((c) & ~7) == '0')
2233 static inline void translate(char *f, char *t)
2235 while (*f != '\0') {
2237 isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
2238 *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
2248 * Checks if the swap device.
2249 * Returns 1 if swap device, < 0 on error or 0 if not swap device.
2251 static int is_swap_device(const char *file)
2262 if (stat(file, &st_buf) < 0)
2264 if (S_ISBLK(st_buf.st_mode))
2265 dev = st_buf.st_rdev;
2266 else if (S_ISREG(st_buf.st_mode)) {
2267 dev = st_buf.st_dev;
2268 ino = st_buf.st_ino;
2272 if ((f = fopen("/proc/swaps", "r")) == NULL)
2275 /* skip the first line */
2276 if (fgets(tmp, sizeof(tmp), f) == NULL)
2279 while (fgets(tmp, sizeof(tmp), f) != NULL) {
2280 if ((cp = strchr(tmp, ' ')) != NULL)
2282 if ((cp = strchr(tmp, '\t')) != NULL)
2284 translate(tmp, buf);
2285 if (stat(buf, &st_buf) != 0)
2287 if (S_ISBLK(st_buf.st_mode)) {
2288 if (dev == st_buf.st_rdev) {
2292 } else if (S_ISREG(st_buf.st_mode)) {
2293 if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
2307 * Check for existing filesystem or partition table on device.
2309 * 1 for existing fs or partition
2310 * 0 for nothing found
2311 * -1 for internal error
2318 blkid_probe pr = NULL;
2322 if (!device || !*device)
2325 ret = -1; /* will reset on success of all setup calls */
2327 pr = blkid_new_probe_from_filename(device);
2331 size = blkid_probe_get_size(pr);
2335 /* nothing to overwrite on a 0-length device */
2341 ret = blkid_probe_enable_partitions(pr, 1);
2345 ret = blkid_do_fullprobe(pr);
2350 * Blkid returns 1 for nothing found and 0 when it finds a signature,
2351 * but we want the exact opposite, so reverse the return value here.
2353 * In addition print some useful diagnostics about what actually is
2361 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL)) {
2363 "%s appears to contain an existing "
2364 "filesystem (%s).\n", device, type);
2365 } else if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL)) {
2367 "%s appears to contain a partition "
2368 "table (%s).\n", device, type);
2371 "%s appears to contain something weird "
2372 "according to blkid\n", device);
2378 blkid_free_probe(pr);
2381 "probe of %s failed, cannot detect "
2382 "existing filesystem.\n", device);
2386 static int group_profile_devs_min(u64 flag)
2388 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2389 case 0: /* single */
2390 case BTRFS_BLOCK_GROUP_DUP:
2392 case BTRFS_BLOCK_GROUP_RAID0:
2393 case BTRFS_BLOCK_GROUP_RAID1:
2394 case BTRFS_BLOCK_GROUP_RAID5:
2396 case BTRFS_BLOCK_GROUP_RAID6:
2398 case BTRFS_BLOCK_GROUP_RAID10:
2405 int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
2406 u64 dev_cnt, int mixed)
2413 allowed |= BTRFS_BLOCK_GROUP_RAID10;
2415 allowed |= BTRFS_BLOCK_GROUP_RAID6;
2417 allowed |= BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
2418 BTRFS_BLOCK_GROUP_RAID5;
2421 allowed |= BTRFS_BLOCK_GROUP_DUP;
2425 ((metadata_profile | data_profile) & BTRFS_BLOCK_GROUP_DUP)) {
2427 "ERROR: DUP is not allowed when FS has multiple devices\n");
2430 if (metadata_profile & ~allowed) {
2432 "ERROR: unable to create FS with metadata profile %s "
2433 "(have %llu devices but %d devices are required)\n",
2434 btrfs_group_profile_str(metadata_profile), dev_cnt,
2435 group_profile_devs_min(metadata_profile));
2438 if (data_profile & ~allowed) {
2440 "ERROR: unable to create FS with data profile %s "
2441 "(have %llu devices but %d devices are required)\n",
2442 btrfs_group_profile_str(data_profile), dev_cnt,
2443 group_profile_devs_min(data_profile));
2447 if (!mixed && (data_profile & BTRFS_BLOCK_GROUP_DUP)) {
2449 "ERROR: DUP for data is allowed only in mixed mode\n");
2455 int group_profile_max_safe_loss(u64 flags)
2457 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2458 case 0: /* single */
2459 case BTRFS_BLOCK_GROUP_DUP:
2460 case BTRFS_BLOCK_GROUP_RAID0:
2462 case BTRFS_BLOCK_GROUP_RAID1:
2463 case BTRFS_BLOCK_GROUP_RAID5:
2464 case BTRFS_BLOCK_GROUP_RAID10:
2466 case BTRFS_BLOCK_GROUP_RAID6:
2474 * Check if a device is suitable for btrfs
2476 * 1: something is wrong, an error is printed
2479 int test_dev_for_mkfs(char *file, int force_overwrite)
2484 ret = is_swap_device(file);
2486 fprintf(stderr, "ERROR: checking status of %s: %s\n", file,
2491 fprintf(stderr, "ERROR: %s is a swap device\n", file);
2494 if (!force_overwrite) {
2495 if (check_overwrite(file)) {
2496 fprintf(stderr, "Use the -f option to force overwrite.\n");
2500 ret = check_mounted(file);
2502 fprintf(stderr, "ERROR: checking mount status of %s: %s\n",
2503 file, strerror(-ret));
2507 fprintf(stderr, "ERROR: %s is mounted\n", file);
2510 /* check if the device is busy */
2511 fd = open(file, O_RDWR|O_EXCL);
2513 fprintf(stderr, "ERROR: unable to open %s: %s\n", file,
2517 if (fstat(fd, &st)) {
2518 fprintf(stderr, "ERROR: unable to stat %s: %s\n", file,
2523 if (!S_ISBLK(st.st_mode)) {
2524 fprintf(stderr, "ERROR: %s is not a block device\n", file);
2532 int btrfs_scan_lblkid()
2537 struct btrfs_fs_devices *tmp_devices;
2538 blkid_dev_iterate iter = NULL;
2539 blkid_dev dev = NULL;
2540 blkid_cache cache = NULL;
2541 char path[PATH_MAX];
2543 if (btrfs_scan_done)
2546 if (blkid_get_cache(&cache, 0) < 0) {
2547 printf("ERROR: lblkid cache get failed\n");
2550 blkid_probe_all(cache);
2551 iter = blkid_dev_iterate_begin(cache);
2552 blkid_dev_set_search(iter, "TYPE", "btrfs");
2553 while (blkid_dev_next(iter, &dev) == 0) {
2554 dev = blkid_verify(cache, dev);
2557 /* if we are here its definitely a btrfs disk*/
2558 strncpy_null(path, blkid_dev_devname(dev));
2560 fd = open(path, O_RDONLY);
2562 printf("ERROR: could not open %s\n", path);
2565 ret = btrfs_scan_one_device(fd, path, &tmp_devices,
2566 &num_devices, BTRFS_SUPER_INFO_OFFSET, 0);
2568 printf("ERROR: could not scan %s\n", path);
2575 blkid_dev_iterate_end(iter);
2576 blkid_put_cache(cache);
2578 btrfs_scan_done = 1;
2583 int is_vol_small(char *file)
2590 fd = open(file, O_RDONLY);
2593 if (fstat(fd, &st) < 0) {
2598 size = btrfs_device_size(fd, &st);
2603 if (size < BTRFS_MKFS_SMALL_VOLUME_SIZE) {
2613 * This reads a line from the stdin and only returns non-zero if the
2614 * first whitespace delimited token is a case insensitive match with yes
2617 int ask_user(char *question)
2619 char buf[30] = {0,};
2620 char *saveptr = NULL;
2623 printf("%s [y/N]: ", question);
2625 return fgets(buf, sizeof(buf) - 1, stdin) &&
2626 (answer = strtok_r(buf, " \t\n\r", &saveptr)) &&
2627 (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y"));
2632 * - file or directory return the containing tree root id
2633 * - subvolume return its own tree id
2634 * - BTRFS_EMPTY_SUBVOL_DIR_OBJECTID (directory with ino == 2) the result is
2635 * undefined and function returns -1
2637 int lookup_ino_rootid(int fd, u64 *rootid)
2639 struct btrfs_ioctl_ino_lookup_args args;
2643 memset(&args, 0, sizeof(args));
2645 args.objectid = BTRFS_FIRST_FREE_OBJECTID;
2647 ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
2650 fprintf(stderr, "ERROR: Failed to lookup root id - %s\n",
2655 *rootid = args.treeid;
2661 * return 0 if a btrfs mount point is found
2662 * return 1 if a mount point is found but not btrfs
2663 * return <0 if something goes wrong
2665 int find_mount_root(const char *path, char **mount_root)
2673 int longest_matchlen = 0;
2674 char *longest_match = NULL;
2676 fd = open(path, O_RDONLY | O_NOATIME);
2681 mnttab = setmntent("/proc/self/mounts", "r");
2685 while ((ent = getmntent(mnttab))) {
2686 len = strlen(ent->mnt_dir);
2687 if (strncmp(ent->mnt_dir, path, len) == 0) {
2688 /* match found and use the latest match */
2689 if (longest_matchlen <= len) {
2690 free(longest_match);
2691 longest_matchlen = len;
2692 longest_match = strdup(ent->mnt_dir);
2693 not_btrfs = strcmp(ent->mnt_type, "btrfs");
2702 free(longest_match);
2707 *mount_root = realpath(longest_match, NULL);
2711 free(longest_match);
2715 int test_minimum_size(const char *file, u32 nodesize)
2718 struct stat statbuf;
2720 fd = open(file, O_RDONLY);
2723 if (stat(file, &statbuf) < 0) {
2727 if (btrfs_device_size(fd, &statbuf) < btrfs_min_dev_size(nodesize)) {
2736 * test if name is a correct subvolume name
2737 * this function return
2738 * 0-> name is not a correct subvolume name
2739 * 1-> name is a correct subvolume name
2741 int test_issubvolname(const char *name)
2743 return name[0] != '\0' && !strchr(name, '/') &&
2744 strcmp(name, ".") && strcmp(name, "..");
2748 * test if path is a directory
2749 * this function return
2750 * 0-> path exists but it is not a directory
2751 * 1-> path exists and it is a directory
2752 * -1 -> path is unaccessible
2754 int test_isdir(const char *path)
2759 ret = stat(path, &st);
2763 return S_ISDIR(st.st_mode);
2766 void units_set_mode(unsigned *units, unsigned mode)
2768 unsigned base = *units & UNITS_MODE_MASK;
2770 *units = base | mode;
2773 void units_set_base(unsigned *units, unsigned base)
2775 unsigned mode = *units & ~UNITS_MODE_MASK;
2777 *units = base | mode;
2780 int find_next_key(struct btrfs_path *path, struct btrfs_key *key)
2784 for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
2785 if (!path->nodes[level])
2787 if (path->slots[level] + 1 >=
2788 btrfs_header_nritems(path->nodes[level]))
2791 btrfs_item_key_to_cpu(path->nodes[level], key,
2792 path->slots[level] + 1);
2794 btrfs_node_key_to_cpu(path->nodes[level], key,
2795 path->slots[level] + 1);
2801 char* btrfs_group_type_str(u64 flag)
2803 u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
2804 BTRFS_SPACE_INFO_GLOBAL_RSV;
2806 switch (flag & mask) {
2807 case BTRFS_BLOCK_GROUP_DATA:
2809 case BTRFS_BLOCK_GROUP_SYSTEM:
2811 case BTRFS_BLOCK_GROUP_METADATA:
2813 case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
2814 return "Data+Metadata";
2815 case BTRFS_SPACE_INFO_GLOBAL_RSV:
2816 return "GlobalReserve";
2822 char* btrfs_group_profile_str(u64 flag)
2824 switch (flag & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2827 case BTRFS_BLOCK_GROUP_RAID0:
2829 case BTRFS_BLOCK_GROUP_RAID1:
2831 case BTRFS_BLOCK_GROUP_RAID5:
2833 case BTRFS_BLOCK_GROUP_RAID6:
2835 case BTRFS_BLOCK_GROUP_DUP:
2837 case BTRFS_BLOCK_GROUP_RAID10:
2844 u64 disk_size(char *path)
2848 if (statfs(path, &sfs) < 0)
2851 return sfs.f_bsize * sfs.f_blocks;
2854 u64 get_partition_size(char *dev)
2857 int fd = open(dev, O_RDONLY);
2861 if (ioctl(fd, BLKGETSIZE64, &result) < 0) {
2870 int btrfs_tree_search2_ioctl_supported(int fd)
2872 struct btrfs_ioctl_search_args_v2 *args2;
2873 struct btrfs_ioctl_search_key *sk;
2874 int args2_size = 1024;
2875 char args2_buf[args2_size];
2877 static int v2_supported = -1;
2879 if (v2_supported != -1)
2880 return v2_supported;
2882 args2 = (struct btrfs_ioctl_search_args_v2 *)args2_buf;
2886 * Search for the extent tree item in the root tree.
2888 sk->tree_id = BTRFS_ROOT_TREE_OBJECTID;
2889 sk->min_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2890 sk->max_objectid = BTRFS_EXTENT_TREE_OBJECTID;
2891 sk->min_type = BTRFS_ROOT_ITEM_KEY;
2892 sk->max_type = BTRFS_ROOT_ITEM_KEY;
2894 sk->max_offset = (u64)-1;
2895 sk->min_transid = 0;
2896 sk->max_transid = (u64)-1;
2898 args2->buf_size = args2_size - sizeof(struct btrfs_ioctl_search_args_v2);
2899 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH_V2, args2);
2900 if (ret == -EOPNOTSUPP)
2907 return v2_supported;
2910 int btrfs_check_nodesize(u32 nodesize, u32 sectorsize)
2912 if (nodesize < sectorsize) {
2914 "ERROR: Illegal nodesize %u (smaller than %u)\n",
2915 nodesize, sectorsize);
2917 } else if (nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2919 "ERROR: Illegal nodesize %u (larger than %u)\n",
2920 nodesize, BTRFS_MAX_METADATA_BLOCKSIZE);
2922 } else if (nodesize & (sectorsize - 1)) {
2924 "ERROR: Illegal nodesize %u (not aligned to %u)\n",
2925 nodesize, sectorsize);
2932 * Copy a path argument from SRC to DEST and check the SRC length if it's at
2933 * most PATH_MAX and fits into DEST. DESTLEN is supposed to be exact size of
2935 * The destination buffer is zero terminated.
2936 * Return < 0 for error, 0 otherwise.
2938 int arg_copy_path(char *dest, const char *src, int destlen)
2940 size_t len = strlen(src);
2942 if (len >= PATH_MAX || len >= destlen)
2943 return -ENAMETOOLONG;
2945 __strncpy__null(dest, src, destlen);